While the weather will make for a tough game, it will have no impact on their outfits, said Mr Telban, whose mother, a dressmaker, made their black-and-white-striped suits.

"My mum made them, it took her three weeks, day and night, to make two of them," said Mr Telban.

"Thunderstorms, whatever, we're not going to wear ponchos or nothing."

While it would be a tough and hard game in the wet, the men believe their beloved Magpies will triumph.

But Geelong fan Dorothy Mahony, 59, believes the conditions will work in favour of the Cats.

"We're hoping for a magnificent Geelong victory," said Ms Mahony.

"I think it'll just prove how good Geelong really are.

"I think the experienced players will handle the wet really well and I think because the conditions are going to be so different to what both teams anticipated it'll be really challenging for everybody.

"It might not be the fast game that was anticipated so hopefully that will work to Geelong's advantage."

With her Western Bulldogs out of the mix, Prime Minister Julia Gillard is also backing the Cats.

"There are no rangas and no dogs playing today, so I've had to make a decision between the two teams available," said Ms Gillard as she addressed the North Melbourne grand final breakfast at Docklands.

"Collingwood, and anyone but Collingwood. So yes, I've gone for anyone but Collingwood, I've gone for Geelong."

Collingwood is hoping to secure back-to-back premierships, while Geelong is going for its third grand final win in five years.

Police have warned drink drivers and thugs will be caught and punished during the grand final weekend.

Road Police Acting Superintendent Martin Boorman said hundreds of additional police would be on the city's streets and every available vehicle on the roads.